JP2004528166A5

JP2004528166A5 -

Info

Publication number: JP2004528166A5
Application number: JP2002577106A
Authority: JP
Filing date: 2002-02-20
Publication date: 2005-12-22

Claims

In reversible filter centrifuge without cloth,
A centrifugal drum rotatably mounted in a drum housing and having a drum wall with a stationary dimensionally stable filter medium;
A shaft for rotationally driving the drum;
A lid that hermetically seals the open end of the drum at its edge;
Means for feeding the suspension to be filtered, comprising a filling pipe leading into the interior of the drum;
A drum base disposed within the drum, wherein the drum base and the filter media are axial with respect to each other for mechanically discharging solid components retained by the filter media from the drum; The drum base has a sealing member on a peripheral surface thereof, and the sealing member is adjacent to the closed end wall of the drum when the drum base is in a retracted position. A drum base that sealingly contacts the cylindrical wall of the drum
A non-cross reversible filter centrifuge comprising a pneumatic device for pulling away solid residue.

The centrifuge of claim 1, wherein the drum base has a diameter that is only slightly smaller than the inner diameter at the closed end wall of the drum.

The centrifugal apparatus according to claim 1, wherein the filter medium is self-supporting.

The centrifugal device according to any one of claims 1 to 3, wherein the filter medium is made of metal, ceramic, plastic, or a mixture of these materials.

The centrifugal apparatus according to claim 1, wherein the pneumatic apparatus generates a gas flow in an axial direction of the drum.

The centrifugal device according to any one of claims 1 to 5, wherein the pneumatic device generates a gas flow in a radial direction of the drum.

The centrifugal device according to claim 1, wherein the pneumatic device can be synchronized with a relative movement of the drum base and the drum wall.

The centrifugal apparatus according to claim 7, wherein the pneumatic device and the drum wall can be moved relative to each other in an axial direction of the drum.

The centrifugal apparatus according to claim 1, wherein the pneumatic device generates a pulsed gas flow.

10. The pneumatic device according to claim 1, wherein the pneumatic device comprises a plurality of nozzle-type outlets for gas flow, and the outlets can be driven to rotate at a rotational speed different from the rotational speed of the drum wall. The centrifuge described in 1.

11. The centrifugal apparatus according to claim 1, wherein the pneumatic means has a plurality of nozzle-type outlets inside the drum.

12. The centrifuge of claim 11, wherein at least some of the nozzle type outlets of the pneumatic device located inside the drum are located on the drum base.

The centrifugal apparatus according to any one of claims 1 to 12, wherein an outlet for washing the drum wall with a liquid detergent such as a solvent is provided inside the drum.

The centrifugal device according to claim 1, wherein the lid is firmly coupled to the drum base by a spacer.

The centrifugal device according to any one of claims 1 to 14, wherein the drum housing extends conically in a direction extending from an open end of the drum to a closed end wall.

16. Centrifugal device according to any one of the preceding claims, characterized in that the drum wall has a slightly conical shape and extends towards the open end.

The lid has an opening for receiving a filling pipe of the means for feeding the suspension to be filtered, the outlet end of the filling pipe being located inside the drum during centrifugation. Item 17. The centrifuge device according to any one of items 1 to 16.

The filling pipe can be coupled to a pressure source or a vacuum source to change the pressure in the drum, and a rotating and sliding seal allows the rotary seal to seal the filling pipe against the lid when rotating. 18. A sliding seal seals the pipe against the lid when moving axially, so that the filling pipe is kept in a sealing relationship with the lid. Centrifuge device.

9. The centrifugal device according to claim 8, wherein the filling pipe is supported by the housing by a resilient attachment portion that enables the filling pipe to swing together with the rotation and sliding seals.

20. The rotation and sliding seal comprises a sealing ring and / or a wiping ring, and comprises a sleeve rotatably mounted on a bush fixed to the lid. The centrifugal device described.

21. Centrifugal device according to claim 20, characterized in that the filling pipe has a thick area with tapers on both sides at the outlet end.

The filling opening of the lid can be hermetically sealed by a sealing element that rotates with the drum and avoids friction without engaging the filling pipe. The centrifuge according to claim 1.

23. The centrifuge of claim 22, wherein the drum can be coupled to a pressure source or a vacuum source by a pipe exiting from an end remote from the filling pipe.

The drum is attached to a hollow shaft, and the sealing element is movably attached to the shaft so as to form a tight seal between the feed opening and the interior of the drum. The centrifuge according to claim 22 or 23.

The centrifuge according to any one of claims 17 to 24, wherein the filling pipe is rotatably mounted around a longitudinal axis thereof and can be rotated together with the drum around the axial line.

26. The centrifugal device according to claim 25, wherein the filling pipe can be rotationally driven by the driving means substantially in synchronization with the drum.

26. A sealing element that can be selectively moved to an open position or a closed position is arranged to provide a seal between the feed opening of the lid and the filling pipe. The centrifuge described in 1.

In order to move the drum base and eject the filter cake mechanically, the drum and the lid are axially relative to each other by a rotating hollow shaft and a support shaft that can be moved back and forth therein. The centrifuge according to any one of claims 1 to 27, which is movable.

A screw spindle is disposed on the support shaft, a nut is provided that engages the screw spindle, and the screw spindle or the nut is driven to rotate by a motor, depending on the speed of the screw spindle or the nut relative to the speed of the hollow shaft. 29. The centrifugal apparatus according to claim 28, wherein the support shaft can be expanded and contracted back and forth in the hollow shaft.

The centrifuge comprises a safety device that prevents the opening of the drum by removal of the lid as long as the drum rotates at a speed above a certain critical speed beyond which the opening of the drum is dangerous, The drum and the lid can be moved axially relative to each other by a rotating hollow shaft or a support shaft extending back and forth in the hollow shaft for discharging the filter cake by the drum base. The centrifuge according to any one of claims 1 to 29.

A screw spindle is disposed on the support shaft, and a nut that engages the screw spindle is provided, and the screw spindle or the nut is rotationally driven by a motor so that the screw spindle or the drum with respect to the speed of the hollow shaft and the drum Depending on the speed of the nut, the support shaft can be expanded and contracted back and forth in the hollow shaft, and the drum is opened when the speed of the screw spindle or nut driven by the motor is higher than the speed of the hollow shaft, The drum closes when the speed of the screw spindle or nut is lower than the speed of the hollow shaft, and the maximum speed of the motor used is that the maximum speed imparted to the screw spindle or nut is less than the critical speed of the drum. The drum is at the critical speed Centrifugal apparatus according to claim 30, characterized in that open only when the remote is rotating at a low speed.

The screw spindle or nut can be driven at different speeds by a plurality of motors that can be switched on selectively, and the maximum speed of these motors used is the maximum imparted to the screw spindle or nut by them. 32. The centrifuge of claim 31, wherein the speed is such that it is lower than the critical speed of the drum.

A sliding shaft in which a flexible and / or expandable partition wall is disposed between the closed end wall of the centrifugal drum and the drum base movable relative thereto, the wall carrying the drum base The centrifuge according to any one of claims 1 to 32, wherein a seal is provided between the inside of the centrifuge drum and the inside of the centrifuge drum that receives the suspension.

The partition wall is in the form of a bellow that surrounds the sliding shaft ring and is fixed to the closed end wall on one side and to the drum base on the other side. The centrifuge according to claim 33.

35. The centrifugal apparatus according to claim 33 or 34, wherein means for monitoring a pressure difference between pressures existing on both sides of the partition wall is provided.

The centrifuge has a device for weighing, the centrifuge is mounted so that it can be tilted in a vertical plane, and the force measuring member detects and compensates for the tilting motion depending on the weight of the centrifuge The means for balancing out the disturbance force caused by the fluctuating gas pressure so that the gravimetric process is not affected by the disturbance force, and the compensation means further comprises a sensor for detecting the gas pressure in the centrifugal device, and the detected gas pressure The centrifugal device according to any one of claims 1 to 35, wherein a correction signal for weight display is generated in accordance with a change in the weight.

37. The centrifuge according to claim 36, wherein the centrifuge can be rotated around a horizontal rotation axis.

The centrifuge housing has a first chamber with an outlet for discharging the filtrate and a second chamber with an outlet for discharging the filter cake, the first chamber comprising: A second fully independent housing section is sealingly surrounded by a first fully independent housing section, the two chamber sections being separate from each other. The mounting is such that it can be rotated in different directions around an axis, the two housing sections being separately rotatable relative to the centrifugal drum between closed and open states. The centrifugal apparatus according to any one of 1 to 37.

40. The centrifuge of claim 38, wherein the two housing sections can be rotated about a vertical axis.

The first housing section has a generally annular shape, the second housing section has a generally cup shape with a substantially closed end wall, and the second section is closed. 40. The centrifuge of claim 38, wherein the centrifuge is sometimes in intimate contact with the first section by an edge far from the end wall.

Between the housing and the centrifugal drum there is an annular gap in the region of the filtrate housing section and the solids housing section at the edge of the drum, and the annular gap surrounds the drum edge with the flow of gas blocking medium A protective means is provided, wherein the blocking medium prevents undesired movement of gas, liquid and / or solid material between the filtrate housing section and the solid housing section. 40. The centrifuge according to any one of 40.

42. A flow of two gas blocking media can be generated in the toroidal gap, one of which is directed to the filtrate housing section and the other is directed to the solids housing section. Centrifuge device.

43. Centrifugal device according to claim 41 or 42, characterized in that a gas shuttle pipe with a shut-off valve is provided between the filtrate housing section and the solids housing section.

A solid dryer is provided downstream, and the dehumidification and drying of the solid are performed in the centrifugal drum by centrifugal separation, compression by a pressurized gas, and thermal convection generated by a flowing drying gas, and in the solid dryer The centrifugal device according to any one of claims 1 to 43, wherein the centrifugal device is performed by thermal convection generated by a flowing drying gas.

The reversible filter centrifuge and the solids dryer are combined by a sealing means for sealingly separating the centrifuge and the dryer from each other to form a unit, and a sensor is connected to the centrifuge and the solids dryer. The degree of dehumidification and drying that has been placed there and other relevant operating parameters, such as the weight of the drum content, the pressure of the filtrate, the temperature, the flow rate and / or the pH, the rotational speed and the suspension supplied The turbid water content, and inflow, are measured, on the other hand, an overall control means is provided, which is actuated by the reading provided by the sensor, and accordingly the rotational speed of the reversible filter centrifuge Adjusting the operation data such as the gas pressure, the gas flow rate, and / or the gas temperature, and / or the temperature of the surface in contact with the solid, and the control means It automatically adjusts these operating data to adjust the operating time of dehumidification and drying in the centrifuge and the solids dryer, and at the same time the thermal energy in the solids dryer is on the other hand the mechanical centrifuge energy 45. Centrifugal device according to claim 44, characterized in that it is separated from the centrifugal device in an economically optimal manner.

The centrifuge has a device for weighing, the centrifuge housing is mounted to rotate about a pivot axis, and the force measuring member is a different filling degree of the drum by the suspension or of the suspension. Detects runout dependent on the weight of the centrifuge housing around the pivot shaft caused by different dehumidification of solids components, the runout is displayed on a measurement indicator, and the drum is at or above atmospheric pressure. A pipe for generating a low pressure is provided, and the line of action of the force generated in the pipe by a pressure exceeding or lower than the atmospheric pressure is oriented in a direction crossing the rotation axis of the device housing. The centrifuge according to any one of claims 1 to 45, wherein:

A housing that can be rotated about a pivot axis with the centrifugal device and the housing around the pivot axis caused by different filling degrees of the drum by suspension or different dehumidification of solid components of suspension A force measuring member that senses a weight-dependent runout, wherein the runout is displayed on a measurement indicator, and the drum is provided with a pipe for generating a pressure above or below atmospheric pressure, 46. The centrifuge of any one of claims 1-45, wherein a sensor that senses pressure in the drum can generate a correction signal and thereby correct a reading in response to the pressure.

A method for separating a suspension into a filtrate and a solid component using the clothless reversible filter centrifuge according to any one of claims 1-47,
The suspension is carried into the drum through a filling pipe, the filtrate passes through the filter medium by centrifugal force generated when the drum rotates, and the solid component is transferred to the inner wall of the drum by the filter medium. After mechanical discharge of solid components by the drum base, the solid component residues left in the filter medium are removed from the drum by air pressure by a gas flow acting in the radial and / or axial direction A method characterized by being made.

49. The flow of gas through the filter medium from outside to inside of the drum to disaggregate the solid component prior to mechanical discharge of the solid component. Method.

50. The method of claim 49, wherein the gas flow is generated by creating a pressure below atmospheric pressure within the drum.

50. The method of claim 49, wherein the gas flow is generated in the form of one or more pressures or vacuum pulses.

52. A radially acting gas flow is generated while the drum base is again moved from its starting position to a discharge position adjacent to the open end of the drum. The method according to any one of the above.

A radially acting gas flow is generated progressively in synchronism with the movement of the drum base from a position adjacent to the start position of the drum base toward a discharge position. Item 53. The method according to Item 52.

54. A method according to claim 52 or 53, wherein a radially acting steady gas flow is generated as the drum rotates.

54. A method according to claim 52 or 53, wherein an axially acting gas flow is superimposed on the radially acting gas flow.

56. A gas flow acting in the axial direction is generated in synchronism with the movement of the drum base from a start position to a discharge position while proceeding therewith. 2. The method according to item 1.